Carbon Steel Round Bars
Carbon Steel Round Bars Manufacturer, Supplier & Exporter in India
Carbon steel round bars and MS round bars are among the most widely used industrial metal products, valued for their exceptional strength, durability, and versatility across structural and mechanical applications. As a leading manufacturer in India, we produce carbon steel rods and mild steel round bars using advanced hot rolling and cold finishing processes to deliver superior mechanical properties. These carbon steel round bars serve critical roles in construction frameworks, automotive components, machinery manufacturing, and heavy engineering projects where reliable performance is non-negotiable.
A carbon steel round bar is a solid cylindrical rod manufactured through hot rolling, forging, or precision cold finishing to achieve exact dimensional tolerances. We supply these bars in industry-standard grades including ASTM A105 round bars for high-pressure applications, ASTM A350 LF2 round bars for low-temperature service, and EN8 round bars for general engineering. Each grade delivers distinct chemical compositions and mechanical properties tailored to specific performance requirements — from high tensile strength and excellent machinability to cost-effective alternatives to alloy steels.
With over 15 years of manufacturing expertise, Stellar Alloys Steel Pipes and Tubes supplies premium carbon steel bar stock, mild steel round bars, and MS round rods across India and 20+ export markets. Our ISO 9001:2015 certified facility produces bars in diameters ranging from 6mm to 500mm with black, bright, and polished finishes to meet diverse fabrication needs. Industries choose our mild steel round bars and carbon steel rods for their superior weldability, consistent machinability, and third-party verified material certifications that ensure compliance with ASTM, EN, and IS standards.
Table of Contents
- Types of Carbon Steel Round Bars
- Specification of Carbon Steel Round Bars
- Chemical Composition of Carbon Steel Round Bars
- Mechanical Properties of Carbon Steel Round Bars
- Carbon Steel Round Bar Sizes
- Carbon Steel Round Bar Price List
- Applications & Uses of Carbon Steel Round Bars
- Why Choose Stellar Alloys for Carbon Steel Round Bars
- Packaging & Delivery
- Dimensional Tolerances
- FAQs About Carbon Steel Round Bars
Types of Carbon Steel Round Bars
We manufacture stainless steel round bars in multiple grades and finishes to meet diverse industrial requirements:
EN8 Round Bars
ASTM A350 LF2 Round Bars
ASTM A105 Round Bars
- ASTM A105 Round Bars
ASTM A105 round bars are forged carbon steel bars designed for high-pressure piping applications in temperatures up to 425°C. With a maximum carbon content of 0.35% and manganese range of 0.60-1.05%, these bars deliver minimum tensile strength of 485 MPa and yield strength of 250 MPa. Industries commonly use A105 bars for manufacturing valve bodies, flanges, pump components, and pressure vessel fittings where reliability under stress is critical. - ASTM A350 LF2 Round Bars
ASTM A350 LF2 round bars are low-temperature carbon steel bars engineered for service down to -45°C without losing ductility. The ‘LF’ designation (Low Ferrite) indicates controlled ferrite content to prevent brittle fracture in cryogenic conditions. These bars are essential for LNG plants, refrigeration systems, petrochemical facilities, and offshore platforms where sub-zero temperatures demand impact-resistant materials with Charpy V-notch toughness. - EN8 Round Bars
EN8 round bars (equivalent to 080M40 in British Standard) are medium carbon steel bars with 0.36-0.44% carbon content, offering tensile strength of 550-700 MPa. The higher carbon level compared to mild steel provides enhanced hardness (201 HB) and wear resistance, making EN8 ideal for manufacturing gears, shafts, axles, bolts, and general engineering components requiring moderate strength and good machinability. These bars can be heat-treated for further hardness improvements.
Specification of Carbon Steel Round Bars
Specification | Details |
Standard | ASTM A105, ASTM A350 LF2, EN8 |
Material Grade | Carbon Steel / Mild Steel |
Diameter | 6 mm to 500 mm |
Length | 3 m to 6 m |
Finish | Black, Bright, Polished |
Surface Treatment | Hot Rolled, Cold Drawn, Peeled, Turned & Polished, Centerless Ground |
Form | Round Bars, Carbon Steel Rods |
Chemical Composition of Carbon Steel Round Bars
Element | ASTM A105 (%) | ASTM A350 LF2 (%) | EN8 (%) |
Carbon | 0.35 max | 0.30 max | 0.36 – 0.44 |
Manganese | 0.60 – 1.05 | 0.60 – 1.35 | 0.60 – 1.00 |
Phosphorus | 0.035 max | 0.035 max | 0.05 max |
Sulfur | 0.04 max | 0.04 max | 0.05 max |
Silicon | 0.10 – 0.35 | 0.15 – 0.30 | 0.10 – 0.35 |
Mechanical Properties of Carbon Steel Round Bars
Property | ASTM A105 | ASTM A350 LF2 | EN8 |
Tensile Strength | 485 MPa | 485 MPa min | 550 – 700 MPa |
Yield Strength | 250 MPa | 250 MPa min | 280 MPa |
Elongation | 22% | 22% min | 16% |
Hardness | 187 HB | 187 HB max | 201 HB |
Impact Toughness | — | 27 J at -45°C (Charpy V-notch) | — |
Carbon Steel Round Bar Sizes
Carbon steel round bar sizes are available in various diameters to meet industrial requirements.
Diameter | Length |
6 mm – 12 mm | 3 m – 6 m |
16 mm – 50 mm | 3 m – 6 m |
60 mm – 150 mm | 3 m – 6 m |
160 mm – 500 mm | Custom |
Custom sizes can also be manufactured based on project specifications.
Carbon Steel Round Bar Price List
MS round bar price per kg and carbon steel round bar pricing depend on multiple factors including grade specification, diameter, finish type, order quantity, and current raw material costs. As a direct manufacturer, we offer competitive factory rates for ASTM A105, EN8, and A350 LF2 grades with transparent quotations based on your exact requirements. Our pricing includes material certifications, third-party test reports, and flexible payment terms for bulk orders.
Factors Affecting Carbon Steel Round Bar Price:
- Material grade (A105, EN8, A350 LF2) and carbon content
- Diameter and length specifications
- Surface finish (black, bright bar, polished, peeled)
- Order quantity (bulk discounts available)
- Testing requirements (mill test certificate, material certifications)
- Delivery location and logistics
Applications & Uses of Carbon Steel Round Bars
Carbon steel rods and MS round bars are used in a wide range of industries because of their strength and versatility.
Common applications include:
- Construction and infrastructure projects
- Automotive and mechanical engineering
- Manufacturing of shafts and gears
- Oil and gas industry
- Pump and valve components
- Structural frameworks and support systems
- Industrial machinery and equipment
These carbon steel bar stock products are essential materials for many engineering and fabrication processes.
Our stainless steel round bars serve mission-critical applications across multiple industries due to their exceptional strength, corrosion resistance, and reliability in harsh environments:
Common applications include:
- Oil and Gas Industry – Downhole pump shafts, valve stems, instrumentation components, and wellhead equipment
- Chemical Processing Plants – Reactor vessel shafts, agitator components, pump impellers, and corrosion-resistant fasteners
- Marine and Offshore Structures – Propeller shafts, deck equipment, rigging hardware, and saltwater-resistant fittings
- Automotive and Mechanical Engineering – Engine components, transmission shafts, precision machined parts, and suspension elements
- Pump and Valve Manufacturing – Valve stems, pump shafts, piston rods, and high-pressure fittings
- Construction and Structural Frameworks – Architectural supports, railing systems, and load-bearing structural members
- Food Processing Equipment – Mixer shafts, conveyor components, sanitary fittings, and hygienic processing machinery
- Aerospace Components – Landing gear parts, high-strength fasteners, precision machined aircraft components
Why Choose Stellar Alloys for Carbon Steel Round Bars
- ISO 9001:2015 Certified Manufacturing — Quality management systems certified by TÜV SÜD for consistent product excellence
- 15+ Years of Manufacturing Expertise — Established in 2010, serving automotive, construction, and energy sectors across India and global markets
- State-of-the-Art Testing Facility — In-house spectrometry, tensile testing, and hardness verification with third-party validation available
- Extensive Inventory — 500+ tons of ready stock in diameters from 6mm to 500mm for same-day dispatch
- Complete Traceability — Heat number tracking, mill test certificates (EN 10204 3.1), and material certifications with every order
- Export to 20+ Countries — Trusted supplier to clients in Middle East, Southeast Asia, Africa, and Europe with full export documentation support
Packaging & Delivery
Our carbon steel round bars are packaged in bundles with protective wrapping to prevent surface damage during transit. Export shipments include wooden crates or palletized packing as per ISPM 15 standards. Standard delivery timeframes: in-stock items ship within 24-48 hours; custom orders within 7-10 working days. We coordinate logistics via trusted freight partners with full tracking and insurance coverage.
Dimensional Tolerances (add under Specifications)
- Hot rolled bars: Diameter tolerance per IS 1852 / ASTM A29
- Cold finished bars: +/- 0.005 inches (0.13mm) diameter tolerance
- Length tolerance: +50mm / -0mm on standard cut lengths
- Straightness: 0.5mm per meter maximum deviation
FAQs About Carbon Steel Round Bars
Hot rolled bars are produced at high temperatures with a scaled surface finish and slightly loose dimensional tolerances, suitable for structural applications. Cold finished bars are drawn through dies at room temperature, resulting in smooth, bright surfaces with tighter tolerances (+/- 0.005 inches), preferred for precision machining and applications requiring superior surface finish.
Yes, mild steel and low-carbon grades like ASTM A105 offer excellent weldability using standard processes (MIG, TIG, stick welding). Higher carbon grades like EN8 may require preheating to prevent cracking. Always use compatible filler wire matching the base material’s carbon content.
Select based on operating conditions: ASTM A105 for high-pressure and elevated temperatures up to 425°C; ASTM A350 LF2 for low-temperature service down to -45°C; EN8 for general engineering requiring moderate strength and heat treatability. Consult our technical team for application-specific recommendations.
We provide mill test certificates (MTC 3.1 per EN 10204), material certifications with full chemical and mechanical test reports, heat number traceability, and third-party inspection reports upon request. All materials are tested for compliance with ASTM, EN, and IS standards.
Yes, we offer custom cutting services to your specified lengths with saw-cut or machine-cut tolerances. Standard stock lengths are 3 to 6 meters, but we can supply bars up to 12 meters or precision-cut pieces as per your drawing requirements.